The Petzl NAO headlamp knows when you need bright light—and when you don't—and automatically adjusts. A sensor above the lamp detects reflected light within the field of view and a microprocessor determines the ideal beam for the conditions. Glance down at a map, for example, and the NAO will shine low-intensity diffused light. Look up at the trail ahead, though, and it focuses to a bright spotlight. $175
I got a Petz-NAO headlamp because I do outdoor concert photography. Mainly I am so paranoid about leaving my equipment behind in the dark I needed something that wouldn't be one of those things that I would also need a light to find. Having this on my head made perfect sense. The battery life is good and the light is excellent. I did some research and called a few places before buying. What sold me was a phone call I made to this company www.healthybizhealthyhome.com/Petzl-NAO-Headlamp_p_124.html They took the time to describe the product and were great at making me feel secure in my purchase with them. Anyway, this product has well earned the time and money I paid for it.